# iter_swap(ranges::concat_view::iterator)

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< cpp‎ | ranges‎ | concat view‎ | iterator

friend constexpr void iter_swap( const /*iterator*/& x, const /*iterator*/& y ) noexcept( /* see description */ ) requires ( /* see description */ ); |  | (since C++26)

Swaps the objects pointed to by the underlying iterators of x and y. Equivalent to std::visit
(
`` [&](const auto& it1, const auto& it2)
`` {
`` if constexpr (std::is_same_v<decltype(it1), decltype(it2)>)
`` ranges::iter_swap(it1, it2);
`` else
`` ranges::swap(*x, *y);
`` },
`` x.`it_`﻿,
`` y.`it_`
);

The expression in the requires clause is equivalent to std::swappable_with<std::iter_reference_t</*iterator*/>,
`` std::iter_reference_t</*iterator*/>> &&
(... && std::indirectly_swappable<ranges::iterator_t<`maybe-const`﻿<Const, Views>>>) .

If x.`it_`﻿.valueless_by_exception() || y.`it_`﻿.valueless_by_exception() is true, the behavior is undefined.

This function is not visible to ordinary unqualified or qualified lookup, and can only be found by argument-dependent lookup when concat_view::`iterator`﻿<Const> is an associated class of the arguments.

### Parameters

x, y | - | iterators

### Exceptions

Let its be a pack of lvalues, where each value is of the corresponding type in const ranges::iterator_t<`maybe-const`﻿<Const, Views>>.

`noexcept` specification:
noexcept(noexcept(ranges::swap(*x, *y)) && ... && noexcept(ranges::iter_swap(its, its)))

### Example

| This section is incomplete Reason: no example

### See also

iter_swap (C++20) | swaps the values referenced by two dereferenceable objects (customization point object)
iter_swap | swaps the elements pointed to by two iterators (function template)

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